/**
 *	Data access object for Payload
 *	Purpose: Encapsulate data access details from Payload Model
 *
 *	Author: Jinson Xu
 *	Date: 7th May 2013
 */
 
 
public class PayloadDAO {

	private HashMap<int,double> payloadMap;
	private PayloadDAO instance = null;
	
	
	private void PayloadDAO {
		//initialize by reading data from whatever location the file is at
		
	}

	public PayLoad getInstance() {
	
		if (instance !== null) {
			return instance;		
		} else {
			return new PayLoadDAO();
		}
	
	}

}